awk

https://blog.csdn.net/weixin_34321977/article/details/89799991?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-12.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-12.control

https://www.cnblogs.com/kevingrace/p/8481965.html

https://www.jianshu.com/p/1bbdbf1aa1bd

https://blog.csdn.net/luochenhuan123/article/details/18666075

https://www.cnblogs.com/kevingrace/p/8481965.html